Centrifugal pump



N. B. WALDRON.

CENTRIFUGAL PUMP. APPLICATION FILED DEC. 23' l9l8- 1,361,93 Patented Dec.14,1920.

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wela'rn 2.5 Walofz'ruz UNITED STATES PATENT OFFICE.

NELSON B. WALDRON', or nwisron, MAINE.

CEKTRIFUGAL PUMP.

- Specification of Letters Patent. P t t 14, 1920 Application filed December 23, 1918. Serial No. 267,890.

To all who'm it concern Be it known that. I, NELSON B. WALDRON, a citizen of the United States, residing at speed, even where the. flare of the pump is comparatively slight, there is a considerable thinning of the water as it approaches the top of the rotary member. This decrease in depth now appears to have a relation to the flow at the lip. With the object thereforeof increasin the rate of lip flow and hence actual de ivery I have devised my present invention in which I provide for the maintenance of a substantially uniform depth during the rise of the water, and I secure an increased acceleration in the discharge.

In the embodiment emplo ed this is accomplished by a tapering o the ribs, this being a simple and satisfactory form and hence employed for the purposes of illustrating my invention. It is to be understood;

however, that this form is employed as illustrative. Throughout the specification and drawings like reference characters are correspondingly employed, and in the drawings Figure 1 pump in accordance with my invention, and Figs. 2 and 3 are transverse sections on the lines 22 and 3-3 of Fig. 1.

I have indicated at 1 an elevating member consisting of an open-ended shell of suitable length, which'is continuously and uni formly flared upwardly, and is made fast, as by the spiders 2, to a shaft '3'that is journaled in suitable bearings 4. Shaft 3 is rotated from any suitable power source, as

the motor 8, by any suitable power trans- 'mitting connections,

as the sheave 5 on shaft 3, belt G and sheave Lgeared to the shaft of the motor. J p

The lower intake end of the shell is provided with an inturned flange 9 which'functions to support the water entering the shell u'ntil 'it has acquired suflicient momentum i170 rise within the shell.

ojfrder to-prevent any considerable thinis a central vertical section of a' the delivery of the water and which secures a marked increase in the efliciency of the pump.

For the purposes of this applicationI have illustrated the shell as having a plurality of internal, vertically disposed, spaced ribs 10, which taper upwardly from substantially a pointat the intake to relatively considerable width at the discharge end of the shell. The depth of the ribs is preferably equal to the width of the flange 9, and is constant throughout their length, and the sides 11 of the ribs preferably slope inwardly on substantially radial lines.

The total width of all the ribs, that is, the sum of the distances between their sides 11 at, the discharge end of the shell is preferably equal to the difference in circumference of the shell at its intake and discharge ends. In other words, the taper of the ribs is proportional to the flare of the shell, so that the spaces or channels 13.between the ribs are of substantially the same and depth continuously along the By this arrangement, the water within the shell is kept at substantially constant depth and is not permitted to spread or thin out shell, thus preserving the imparted momentum and securing increased rate of. intake and accelerated discharge. The water or other fluid being pumped discharges into a spillway 12 at the upper end of the shell 1. It will be noted that the arms of the spiders 2 are attached to the ribs 10 themselves. This arrangement leaves the channels 13 between the ribs uninterrupted, so that the water may be freely raised. The increased efficiency of the present pump over prior pumps is believed due to the fact that the tapered ribs keep the water at constant depth and prevent it from spreading out; that is to say, the ribs define a channel of uniform capacity from bottom to top of the shell, along which the water travels in a definite path. As will be evident, any tendency of the water to spread out over the extended surface introduces a factor of friction or backlash, which reduces the. momentum of the water. The tapered rib construction of the present invention prevents this spreading out tendency because the defined channel is of uniform'capacity from bottom to top of the shell and oflers no obstruction to the water in its travel from intake to delivery.

Various modifications in the form and construction of my invention may obviously be resorted to if within the limits of the appended claims.

What I therefore claim and desire to secure by Letters Patent is:

1. A pump comprising an upwardly flaring rotatable elevating member having an inwardly projecting flange at its intake end, and having above said flange a plurality of upwardly tapering spaced ribs, effective to counteract the tendency of the liquid to thin out as it approaches the discharge end of the I elevating member.

2. A pump comprising'a vertically dis-' posed upwardly flaring rotatable elevating member having an inwardly projecting flange at its intake end, and'having a plurality of pering upwardly from substantially a point at said flange to relatively considerable width at the discharge end'of the elevating 'member and effective to counteract the tendency of the liquid to thin out as it approaches the discharge end of the elevating member. I

3. A pump comprising a vertically disposed' upwardly flaring rotatable elevating member having an inwardly projecting flange at its intake end, and having a plurality of vertically disposed spaced ribs tapering upwardly from substantially a point at said flange to relatively considerable width at the discharge end of the elevating member and effective to counteract the tendency of theliquid to thin out as it ap. proaches the discharge end of the elevating member, the total width, of the ribsat the discharge end of the elevating member being substantially equal to the difference in circumference at theintake ends of the shell.

4. A pump comprising a vertically disposed upwardly flaring rotatable elevating member having an inwardly projecting vertically disposed spaced ribs ta-.

end and discharge flange at its intake end, and having a plurality of vertically disposed spaced ribs tapering upwardly from substantially a point at said flange to relatively considerable widthat the discharge end of the elevating member and effective to counteract the tendency of the liquid to thin out asit ap; proaches the discharge end of the elevating member, the total width of the ribs at the discharge end of the elevating member being substantially equal to the diiference in circumference at the intake end and discharge ends of the shell, and the sidesof the ribs sloping inwardly on substantially radial lines.

a 5, A'pump comprising an upwardly flaring rotatable elevating member having an inwardly projecting flange at its intake end,

and having above said flange a plurality of ing vertically disposed rotatable shell having aseries of vertically disposed spaced channels of substantially the same width and depth continuously alongthe shell, I

8. A centrifugal pump,- comprising an upwardly flaring rotatable elevating member having a plurality of upwardly tapering spaced ribs providing continuous channels for the passage of the fluid being pumped,

a shaft arranged within said elevating member, and means carried by said shaft and attached to said ribs for rotatably connecting said shaft and elevating member.

In testimony whereof I aflix my signature in presence oftwo witnesses.

NELSON B. WALDRO'N.

Witnesses:

EDGAR M. BRIGGS, RUTH ELLIS.

7. A pump comprising an upwardly flar-' 

